Greenbark Ceanothus (Ceanothus Spinosus) is a perennial shrub in the Rhamnaceae family with moderate care difficulty. It requires drought-tolerant watering and full sun or partial shade light in USDA hardiness zones 8-10. This plant is safe for cats and dogs.

Ceanothus spinosus is a large treelike shrub or small tree native to California and northern Baja California, known for its thorny greenish-brown branches and clusters of pale blue to white flowers.